Device foe finding and limiting the depth of hole in boring-machines



UNITED STATES PATENT OFFICE.

LEVI B. LLOYD, OF WARWICK TOWNSHIP, CHESTER COUNTY, PENNSYLVANIA.

,DEVICE FOR FINDING AND LIMITING THE DEPTH OF HOLE IN BORING-MACHINES,

Specification of Letters Patent No. 17,630, dated June 23, 1857.

To all whom it may concern:

Be it known that I, LEVI B. LLOYD, of Warwick township, in the county ofChester and State of Pennsylvania, have invented a new and usefulImprovement in Boring- Machines 5 and I do hereby declare that thefollowing is a full, clear, and eXact descri tion of the constructionand operation of t e same, reference being had to the annexed drawing,forming part of this specification, in Which- Figure 1 is a frontelevation, and Fig. 2 a sectional view of my machine.

Similar characters of reference denote the same part.

The object of my invention is the feeding ofthe stuff to be perforated,so as to give any required depth of hole; the boring being stopped whenthe desired penetration is effected.

The nature of the invention consists of the combination of a spring anddraw rod arranged and operating as will be described.

In the drawing T is the table on which the block to be bored is placed.It has a slot a through which )rotrudes an arm b of the draw rod c.Tlhis rod passes through a strong spring d acting against the edge ofthe table, and has a screw thread and nut on this extremity. The bit Bis held on a frame F and is turned through wheel W and inion p.

The block X is laid upon the tab e T with vertical branch of the drawrod behind it, the face of the block being against the point of the bit.The nut n is then turned upon the thread of the draw rod, forcing thespring d toward the edge of the table a distance equal to the requireddepth of perforation. Ihe bit is then turned, and the rising of thespring always keeps the block within the action of the bit, until thespring ceases to exert any power; which will be when the perforation hasreached the required depth.

I claim-n The combination of spring, draw rod, and table, arranged andoperating as described.

In testimony whereof, I have hereunto signed my name before twosubscribing witnesses.

LEVI B. LLOYD.

Witnesses:

EvAN SHEELER, JOHN D. FILMAN.

